TABLE I.
Numerical comparisons among CBCT-only, CBCT + sMRI-(Early), and CBCT + sMRI-(Late). Best mean values are shown in bold. P-values greater than 0.05 are underlined.
| Organ | Method | DSC | HD95 (mm) | MSD (mm) | CMD (mm) | VD (CC) |
|---|---|---|---|---|---|---|
| Bladder | ①: CBCT-only | 0.94±0.03 | 3.24±2.13 | 0.97±0.57 | 1.23±1.10 | 9.08±8.32 |
| ②: CBCT+sMRI-(Early) | 0.95±0.03 | 3.23±4.86 | 0.79±0.73 | 0.71 ±0.75 | 3.75±4.34 | |
| ③: CBCT+sMRI-(Late) | 0.96±0.03 | 2.46±2.17 | 0.65±0.67 | 0.65±1.19 | 3.28±6.18 | |
| p-value (① vs. ②) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| p-value (① vs. ③) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| p-value (② vs. ③) | <.01 | <.01 | <.01 | <.01 | 0.01 | |
| Prostate | ①: CBCT-only | 0.87±0.08 | 3.89±2.84 | 1.37 ±0.91 | 2.05±2.07 | 2.82±2.37 |
| ②: CBCT+sMRI-(Early) | 0.89±0.08 | 3.22±2.60 | 1.08±0.88 | 1.45±1.77 | 1.73±2.30 | |
| ③: CBCT+sMRI-(Late) | 0.91±0.08 | 2.97±2.62 | 0.93±0.96 | 1.25±1.82 | 2.51 ±3.31 | |
| p-value (① vs. ②) | <.01 | <.01 | <.01 | <.01 | 0.02 | |
| p-value (① vs. ③) | <.01 | <.01 | <.01 | <.01 | 0.03 | |
| p-value (② vs. ③) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| Rectum | ①: CBCT-only | 0.91 ±0.04 | 2.87±1.47 | 0.94±0.46 | 1.53±1.39 | 3.12±2.33 |
| ②: CBCT+sMRI-(Early) | 0.92±0.04 | 2.59±1.74 | 0.85±0.77 | 1.12± 1.67 | 1.78±2.39 | |
| ③: CBCT+sMRI-(Late) | 0.93±0.04 | 2.69±2.79 | 0.72±0.61 | 1.07±1.58 | 2.80±3.60 | |
| p-value (① vs. ②) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| p-value (① vs. ③) | <.01 | <.01 | <.01 | <.01 | 0.11 | |
| p-value (② vs. ③) | <.01 | 0.22 | <.01 | 0.92 | <.01 | |
| LFH | ①: CBCT-only | 0.93±0.05 | 6.81 ±9.77 | 1.30±1.37 | 2.66±3.89 | 10.50± 12.59 |
| ②: CBCT+sMRI-(Early) | 0.94±0.05 | 6.82±10.38 | 1.22±1.46 | 2.65±4.30 | 9.94±15.83 | |
| ③: CBCT+sMRI-(Late) | 0.95±0.05 | 6.33± 10.09 | 1.05±1.40 | 2.41±4.18 | 8.39±14.98 | |
| p-value (① vs. ②) | <.01 | <.01 | <.01 | 0.07 | 0.20 | |
| p-value (① vs. ③) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| p-value (② vs. ③) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| RFH | ①: CBCT-only | 0.93±0.05 | 6.79±10.34 | 1.32±1.46 | 2.64±4.20 | 10.62± 13.26 |
| ②: CBCT+sMRI-(Early) | 0.94±0.05 | 6.97±10.87 | 1.23±1.50 | 2.67±4.35 | 9.84±14.65 | |
| ③: CBCT+sMRI-(Late) | 0.95±0.05 | 6.47± 10.77 | 1.08±1.48 | 2.40±4.36 | 8.86±15.40 | |
| p-value (① vs. ②) | <.01 | <.01 | <.01 | 0.12 | <.01 | |
| p-value (① vs. ③) | <.01 | <.01 | <.01 | <.01 | <.01 | |
| p-value (② vs. ③) | <.01 | <.01 | <.01 | <.01 | 0.02 |
CBCT, cone-beam CT; sMRI, synthetic MRI; LFH, left femoral heads; RFH, right femoral heads.